It is 'Could I have this dance for the rest of my life' sung by Anne Murray (she didn't write it).
I am transcribing it to guitar for a couple of reasons. I like the song, and along with a couple of other non-classical pieces I have music to show the beauty of classical guitar to people who have no concept of Sor and other composers we hold so dear.
At the music store I could either pay and get it instantly from their printer or pay and wait a week for the commercial print. I chose the latter. I am sure the store has copyright arrangements to print it off, but it still surprised me. I also saw that the printout was typical Letter Size and not the larger commercial print size.
I prefer to buy printed collections, like the Frederic Noad series. You can't argue the price and the printing is big and very sharp when compared with typical downloaded and printed public domain music. I haven't purchased individual classical sheet music, because the books I bought have everything I could ever expect to play in my lifetime and then some.